| """ |
| QAPI event generator |
| |
| Copyright (c) 2014 Wenchao Xia |
| Copyright (c) 2015-2018 Red Hat Inc. |
| |
| Authors: |
| Wenchao Xia <wenchaoqemu@gmail.com> |
| Markus Armbruster <armbru@redhat.com> |
| |
| This work is licensed under the terms of the GNU GPL, version 2. |
| See the COPYING file in the top-level directory. |
| """ |
| |
| from qapi.common import * |
| |
| |
| def build_event_send_proto(name, arg_type, boxed): |
| return 'void qapi_event_send_%(c_name)s(%(param)s)' % { |
| 'c_name': c_name(name.lower()), |
| 'param': build_params(arg_type, boxed, 'Error **errp')} |
| |
| |
| def gen_event_send_decl(name, arg_type, boxed): |
| return mcgen(''' |
| |
| %(proto)s; |
| ''', |
| proto=build_event_send_proto(name, arg_type, boxed)) |
| |
| |
| # Declare and initialize an object 'qapi' using parameters from build_params() |
| def gen_param_var(typ): |
| assert not typ.variants |
| ret = mcgen(''' |
| %(c_name)s param = { |
| ''', |
| c_name=typ.c_name()) |
| sep = ' ' |
| for memb in typ.members: |
| ret += sep |
| sep = ', ' |
| if memb.optional: |
| ret += 'has_' + c_name(memb.name) + sep |
| if memb.type.name == 'str': |
| # Cast away const added in build_params() |
| ret += '(char *)' |
| ret += c_name(memb.name) |
| ret += mcgen(''' |
| |
| }; |
| ''') |
| if not typ.is_implicit(): |
| ret += mcgen(''' |
| %(c_name)s *arg = ¶m; |
| ''', |
| c_name=typ.c_name()) |
| return ret |
| |
| |
| def gen_event_send(name, arg_type, boxed, event_enum_name): |
| # FIXME: Our declaration of local variables (and of 'errp' in the |
| # parameter list) can collide with exploded members of the event's |
| # data type passed in as parameters. If this collision ever hits in |
| # practice, we can rename our local variables with a leading _ prefix, |
| # or split the code into a wrapper function that creates a boxed |
| # 'param' object then calls another to do the real work. |
| ret = mcgen(''' |
| |
| %(proto)s |
| { |
| QDict *qmp; |
| Error *err = NULL; |
| QMPEventFuncEmit emit; |
| ''', |
| proto=build_event_send_proto(name, arg_type, boxed)) |
| |
| if arg_type and not arg_type.is_empty(): |
| ret += mcgen(''' |
| QObject *obj; |
| Visitor *v; |
| ''') |
| if not boxed: |
| ret += gen_param_var(arg_type) |
| else: |
| assert not boxed |
| |
| ret += mcgen(''' |
| |
| emit = qmp_event_get_func_emit(); |
| if (!emit) { |
| return; |
| } |
| |
| qmp = qmp_event_build_dict("%(name)s"); |
| |
| ''', |
| name=name) |
| |
| if arg_type and not arg_type.is_empty(): |
| ret += mcgen(''' |
| v = qobject_output_visitor_new(&obj); |
| ''') |
| if not arg_type.is_implicit(): |
| ret += mcgen(''' |
| visit_type_%(c_name)s(v, "%(name)s", &arg, &err); |
| ''', |
| name=name, c_name=arg_type.c_name()) |
| else: |
| ret += mcgen(''' |
| |
| visit_start_struct(v, "%(name)s", NULL, 0, &err); |
| if (err) { |
| goto out; |
| } |
| visit_type_%(c_name)s_members(v, ¶m, &err); |
| if (!err) { |
| visit_check_struct(v, &err); |
| } |
| visit_end_struct(v, NULL); |
| ''', |
| name=name, c_name=arg_type.c_name()) |
| ret += mcgen(''' |
| if (err) { |
| goto out; |
| } |
| |
| visit_complete(v, &obj); |
| qdict_put_obj(qmp, "data", obj); |
| ''') |
| |
| ret += mcgen(''' |
| emit(%(c_enum)s, qmp, &err); |
| |
| ''', |
| c_enum=c_enum_const(event_enum_name, name)) |
| |
| if arg_type and not arg_type.is_empty(): |
| ret += mcgen(''' |
| out: |
| visit_free(v); |
| ''') |
| ret += mcgen(''' |
| error_propagate(errp, err); |
| QDECREF(qmp); |
| } |
| ''') |
| return ret |
| |
| |
| class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor): |
| |
| def __init__(self, prefix): |
| QAPISchemaModularCVisitor.__init__( |
| self, prefix, 'qapi-events', |
| ' * Schema-defined QAPI/QMP events', __doc__) |
| self._enum_name = c_name(prefix + 'QAPIEvent', protect=False) |
| self._event_names = [] |
| |
| def _begin_module(self, name): |
| types = self._module_basename('qapi-types', name) |
| visit = self._module_basename('qapi-visit', name) |
| self._genc.add(mcgen(''' |
| #include "qemu/osdep.h" |
| #include "qemu-common.h" |
| #include "%(prefix)sqapi-events.h" |
| #include "%(visit)s.h" |
| #include "qapi/error.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qobject-output-visitor.h" |
| #include "qapi/qmp-event.h" |
| |
| ''', |
| visit=visit, prefix=self._prefix)) |
| self._genh.add(mcgen(''' |
| #include "qapi/util.h" |
| #include "%(types)s.h" |
| |
| ''', |
| types=types)) |
| |
| def visit_end(self): |
| self._genh.add(gen_enum(self._enum_name, self._event_names)) |
| self._genc.add(gen_enum_lookup(self._enum_name, self._event_names)) |
| |
| def visit_event(self, name, info, arg_type, boxed): |
| self._genh.add(gen_event_send_decl(name, arg_type, boxed)) |
| self._genc.add(gen_event_send(name, arg_type, boxed, self._enum_name)) |
| self._event_names.append(name) |
| |
| |
| def gen_events(schema, output_dir, prefix): |
| vis = QAPISchemaGenEventVisitor(prefix) |
| schema.visit(vis) |
| vis.write(output_dir) |